Rfc: inner class3

[withinboredom]

Todos:

• make namespace structure work with opcache
• make inheritance work correctly (sees Outer\Middle and Other\Middle the same when using Middle on inherited classes)

Summary by CodeRabbit

• New Features

  • Introduced robust support for inner classes with enhanced syntax and improved resolution of class scopes.
  • Expanded Reflection capabilities to determine class visibility (inner, private, protected, public).
  • Improved namespace management and autoloading for more reliable class discovery.

• Bug Fixes

  • Clarified error messages for invalid nested class declarations, aiding quicker troubleshooting.

• Tests

  • Added comprehensive tests covering inner class behavior, access modifiers, return types, and scope resolution.
  • Introduced tests for visibility rules and error handling related to inner classes and nested declarations.